Yes, There may be a third camera lurking about. The orginal conversions were done for the BBC by Van Diemens as crash cams. The view finders where not modified to present S-16.
Du-All added a Fiber optic screen to the second camera which I own . The difference in viewing from a fiber optic screen in an SR-EVO and the Ground Glass in the Arri-S was disturbing!
After the DU-All mod they were very close
I had visited the Van Diemen operation in 1999 and met the technical staff. They seemed capable, the Economic crash in 2000/2001 killed them
The technical folks have gone into busness and various parts and acessories can be had thru www.FilmCameraKit.Com.
The camera is really fun to shoot with a pistol grip sort of a poor mans A-minima
Is a nice compliment to an SR package
Like a Arri 2C was a nice match to a Arri BL package. Very practical two camera set up with interchangable lenses and acessories thats's how I use it.